GPWS Mode 6B
Studying Warning and Recording in Instruments for my ATPL's at the moment and I've come across a little odity.
According to the books, GPWS is only active between 50 and 2450 feet. Fine.
Radio Altimeter is active between 0 and 2500 feet. Also Fine.
GPWS gives height callouts and bank angle warnings between 50 and 2450 (mode 6B) yet I swear I've heard a "2500" ("twenty five hundred") callout before. Is the "2450 ft" rule just a minimum requirement or am I missing something that is probably horrendously obvious (or am I just plain wrong?!)
Thanks!
FF